//package com.jyh.service;
//
//import com.jyh.dao.StockDao;
//import com.jyh.entity.Stock;
//import org.springframework.beans.factory.annotation.Autowired;
//import org.springframework.stereotype.Service;
//
///**
// * @author JYH
// * @version 1.0
// * @date 2022/12/8 13:30
// */
//@Service
//public class StockService_syn {
//
//    @Autowired
//    private StockDao stockDao;
//
//    public String decrement(Integer productId) {
//        synchronized (StockService_syn.class.getClassLoader()) {
//            //1.查询商品的库存
//            Stock stock = stockDao.selectById(productId);
//            //2.判断库存是否足够
//            if (stock.getStock() > 0) {
//                stock.setStock(stock.getStock() - 1);
//                int i = stockDao.updateById(stock);
//                System.out.println("商品编号为:" + productId + "的商品库存剩余:" + stock.getStock() + "个");
//                return "商品编号为:" + productId + "的商品库存剩余:" + stock.getStock() + "个";
//            } else {
//                System.out.println("商品编号为:" + productId + "的商品库存不足。");
//                return "商品编号为:" + productId + "的商品库存不足。";
//            }
//        }
//    }
//}
